AASTRA 600d for OpenCom 1000 User Guide (with bookmarks) EN - Manual (Page 32)

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Basic functions
Illumination / display dimming
The keyboard and display are lit. The illumination is activated each time a key is pressed or a call is
made; it remains lit for a user-definable amount of time. To prevent the display illumination from
switching itself off completely after that time, you can activate the display dimming. The illumina-
tion then remains lit at a weak level. This setting does however reduce the battery life. You can make
changes in the Menu ❯❯❯ -> Settings -> Illumination -> Keyboard/Display/Display dimming .
Activating the display illumination
If the display illumination is switched off completely, you can activate it using one of the three keys
below the display (softkeys) without triggering the function stored under that key.
Changing the brightness/contrast of the display
Aastra 610d
Adjust the brightness of the display to your local conditions. Change the contrast in the Menu ❯❯❯
-> Settings -> Display -> Contrast .
Aastra 620d, 630d
Adjust the brightness of the display to your local conditions. Change the brightness in the Menu
❯❯❯
-> Settings -> Display -> Brightness.
Muting the handset
If you do not want your call partner to listen in while you talk to someone in the room for instance,
you can temporarily mute your handset.
You are making a call.
Press the
softkey. The symbol appears on the top line of the display.
Your call partner on the telephone can no longer hear you.
Press the
softkey once more when you want to talk with your call partner again. Your call partner
on the telephone can hear you again.